Trane Picco R32-140 User& Installer's Manual page 43

PROBLEM
Compressor does not start be-
cause of protective devices
High exhaust pressure
Low exhaust pressure
High suction pressure
Low compressor suction pressure
CAUSE
Increase in discharge pressure
Low inlet pressure
Incorrect power supply
Incorrect wiring
Incorrect working conditions
Thermal protection intervention
Damaged pressure switch
High outside air temperature
High water return temperature
Air in the hydraulic circuit
Refrigerant gas charge too high
Poor air flow
Poor water flow rate
High outdoor air temperature
Low plant return water temperature
Residual humidity in the cooling circuit
Air in the hydraulic circuit
Insufficient refrigerant gas charge
High outdoor air temperature
Low plant return water temperature
Expansion valve remains too opened / dam-
aged
Low outdoor air temperature
Low plant return water temperature
Expansion valve remains too closed / clogged/
damaged
Dirty plate heat exchanger
Low air flow rate
Low water flow rate
Picco R32
Inverter air/water heat pumps with axial fan
SOLUTION
Check
Repalce
Check
Check the fan and pump operation
Check
Check
Check
Check the fan and pump operation
43